package com.example.concurrency;

import com.example.concurrency.annoations.NotThreadSafe;
import lombok.extern.slf4j.Slf4j;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;

/**
 * @Author wjc
 * Date on 2020/6/26 9:41
 */
@Slf4j
@NotThreadSafe
public class ConcurrencyTest {

    /**
     * 请求总数
     */
    public static int clientTotal = 1000;
    /**
     * 同时并发的线程数
     */
    public static int threadTotal = 200;
    /**
     * 计数器
     */
    public static int count = 0;


    public static void main(String[] args) throws InterruptedException {
        ExecutorService executorService = Executors.newCachedThreadPool();
        final Semaphore semaphore = new Semaphore(threadTotal);
        final CountDownLatch countDownLatch = new CountDownLatch(clientTotal);

        for (int i = 0; i < clientTotal; i++) {
            executorService.execute(() -> {
                try {
                    semaphore.acquire();
                    add();
                    semaphore.release();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                } catch (Exception ex) {
                    ex.printStackTrace();
                    log.info("exception", ex);
                }
                countDownLatch.countDown();
            });
        }
        countDownLatch.await();
        executorService.shutdown();
        log.info("count:{}", count);
    }

    public static void add() {
        count++;
    }

}
